TOWN OF BELOIT, Wis. (AP) — Federal prosecutors have charged a Denver woman with kidnapping a newborn from a southern Wisconsin home.

U.S. Attorney John Vaudreuil filed the charge against Kristen Rose Smith on Friday afternoon, hours after an Iowa police chief discovered the nearly week-old Kayden Powell alive and well in a plastic storage bin outside a West Branch, Iowa, gas station.

The newborn disappeared from the Town of Beloit house where he was staying with his mother early Thursday morning. Police arrested Smith hours later at a gas station about a half-mile from the station where the newborn was found.

Smith faces life in prison if she’s convicted.

The newborn’s parents reported him missing from the Town of Beloit home in southern Wisconsin where the family was staying early Thursday morning. According to an affidavit accompanying the kidnapping charge, Smith is the mother’s half-sister and had come to visit the family in Wisconsin. She left the home early Thursday morning. Several hours later the newborn’s mother reported the baby missing.

Police arrested Smith at a West Branch, Iowa, gas station on Thursday morning on an outstanding warrant from an unrelated case in Texas. The baby was not in the car, although she had baby clothes, a fake pregnancy belly and a stroller with her, according to the affidavit. Hundreds of officers in Wisconsin, Illinois and Iowa, meanwhile, began searching possible stops on her route.

West Branch Police Chief Mike Horihan was searching the area around a BP gas station off Interstate 80 — about 500 yards from the Kum & Go station where Smith was arrested — when he heard cries that led him to a closed storage crate alongside the building. The baby was inside the crate, swaddled in a blanket but healthy and responsive.

West Branch is about 180 miles southwest of the Town of Beloit.

“I had tears in my eyes,” BP station manager Jay Patel said, recalling his reaction to the police chief telling him that the infant had been found. “It’s good news but it’s sad, too.”

Milwaukee FBI Acting Special Agent-In-Charge G.B. Jones said the effort now is “clearly focused on reuniting mother and child and the rest of the family members with the child.”

It’s unclear how long the newborn was outside in the cold, Jones said. The temperature was about minus 10 Thursday night in the town and only in the single digits when the child was found. The infant was taken to an area hospital for evaluation, Horihan said.

The baby’s great-grandfather, Brian Bennett, said he was “surprised” the child was in good condition.

“It’s funny he lived that long outside. A miracle, I guess,” Bennett, 68, said. “They were just lucky they found him.”